It’s often misunderstood in that people thinks there is nothing you can do once your in that zone. Nothing could be further from the truth. You just can’t stand there, draw, shoot and be unscathed. Get off the X and move, defend and gain that ground.
When I first started the military and later law enforcement we were still being taught all you’ll ever need is a 45 and single shots and shooting one hand behind the back and other silliness like standing there as your being charged. We were dying and being wounded at staggering numbers.
This is something you and yours can do in a very small space with very little equipment. If you don’t have rubber or foam training knives then use paper towels rolls. Wear eye protection for safety. Learn lateral movement and small things like not crossing your feet so you don’t trip up.